Posts

Installing a Mobile Radio in Your Car. Post #1654.

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If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=FzBDf-JEa3w. Installing a mobile radio in your vehicle can be easy if you follow the steps outlined by Pete Hadley (K6BFA) in this video.  Pete shows how he installed his 2 m/70 cm transceiver and antenna in his vehicle without drilling large holes in the vehicle body and by keeping all wires and cables out of sight.  A very efficient and operator- friendly installation. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). https://hamradiohawaii.wordpress.com. https://oahuarrlnews.wordpress.com. https://bigislandarrlnews.com. https://www.eham.net. http://www.southgatearc.org. Thanks for joining us today. Aloha es 73 de Russ (KH6JRM).

EA5ON Mobile HF Antenna. Post #1653.

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If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=1Da43_y_OMw. Here's a simple, cheap, and efficient mobile HF antenna from Duncan (EA5ON).  According to Duncan, the ball mount is from Hustler; the 12-ft/3.65-m extendible whip and screwdriver coil come from MFJ; and the mast extension is from the DX Engineering staff.  While this arrangement makes for an excellent mobile antenna, Duncan feels it's best to operate this antenna system from a stationary position, such as a park, beach, or campground.  For more information on this antenna, please visit http://www.ea5on.com. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). http://oahuarrlnews.wordpress.com. https://hamradiohawaii.wordpress.com. https://bigislandarrlnew

Hanging Ham Radio Antenna From Trees W/Slingshot. Post #1652.

Hanging Ham Radio Antenna From Trees W/Slingshot. Post #1652. Source:  https://www.youtube.com/watch?v=UDkbNcbQl2o. Author:  KM6JUR. Please click link to download the video. Comment: Tall trees on your property can serve as ideal supports for your antennas, be they HF, VHF, or UHF.  The major problem with tree-supported antennas is getting all those wires and small beams into the upper regions of the tree without incurring antenna damage or lost wire. In this video from KM6JUR, we see how a simple slingshot, fishing reel, a few sinkers/weights, and some fishing line can launch your antenna at a desirable height for DX contacts.  Of course, as this video points out, you may have to try a few times before your antenna is firmly secured in a tree. Although there are several commercial antenna launchers available, I find a do-it-yourself approach more to my liking.  My launch system is similar to the one used in this video.  I have an old Walmart "Marksman Folding Sling

5/8 wave J-pole antenna for 145 MHz. Post #1651.

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If you can't view the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=fEdy7mbZ5ms. Thanks to Pityu Nagy for this fascinating video on how to make a 5/8 J-pole antenna for 145 MHz.  Pityu was able to use some copper tubing, a steel wire from an old CB antenna, and a homemade coil to make this efficient and simple 2 meter antenna.  This would make an excellent emergency 2 meter antenna for your club or home station. For the latest Amateur/Ham Radio news and information, please visit these websites: http://www.HawaiiARRL.info. http://www.arrl.org. http://www.arrl.org/arrl-audio-news. https://oahuarrlnews.wordpress.com. https://hamradiohawaii.wordpress.com. https://bigislandarrlnews.com. https://www.eham.net. http://www.southgatearc.org. Thanks for joining us today. Aloha es 73 de Russ (KH6JRM).

Design your own 5/8 wave vertical antenna. Post #1650.

Design your own 5/8 wave vertical antenna. https://www.qsl.net/w4sat/five8th.htm. Author:  W4SAT. Please click link to read the full article. Comment:  Here's a handy calculator for those who wish to experiment with 5/8 wavelength antennas, both for HF and VHF/UHF. Despite some matching and loading issues, the 5/8 wave antenna can deliver approximately 3 dB gain over a 1/4 wave vertical and exhibits a low angel of radiation (approximately 16 degrees)--something that will help you snag more DX contacts. The article outlines some of the design considerations necessary to make this type of vertical antenna work properly.  The discussion ends with an easy plug in program that figures element lengths in both feet and meters.  The program uses the standard formula of 585/f for feet and 178.308/f for meters. With a properly designed coil, a decent ground plane element, and some stiff wire, you can have an efficient 5/8 wave vertical antenna in just a few hours. For the la